For ZIP and GZIP formats, 7-Zipprovides a compression ratio that is 2-10 % better than the ratio provided by PKZip and WinZip

Strong AES-256 encryption in 7z and ZIP formats

Self-extracting capability for 7z format

Integration with Windows Shell

Powerful File Manager

Powerful command line version

Plugin for FAR Manager

Localizations for 69 languages

Other than supporting almost any and every format a Windows user is likely to encounter, it’s support for LZMA compression (one of the absolute best general compression algorithms around — only BZIP2 is even a close competitor) gives you the ability to create small archives for upload, email, etc.